摘要
为研究高速铁路箱式路基加腋方式对结构静力特性的影响,找到更加合理的箱式路基加腋方式。将箱式路基拆为独立构件,通过静力分析计算出各独立构件的配筋方式。使用ABAQUS软件进行数值模拟,针对箱式路基结构顶板和竖板连接节点处的应力集中现象,采用控制变量法,分别研究三角形腋不同的加腋高度和加腋角度对节点处应力集中的影响,提出最优加腋方式,优化箱式路基结构的静力特性。分析结果表明:固定腋高度为400 mm,当腋角度在15°~60°之间时,随着腋角度增大,应力突变量降低比S_(r)值不断减小;当腋角度在60°~75°之间时,随着腋角度增大,S_(r)值不断增大;最优腋角度在45°~60°之间。当腋角度固定为60°时,随着加腋长度增大,S_(r)值整体呈减小趋势,最优腋长度在300~400 mm之间。箱式路基配筋方式和最优加腋方式的确定,具有一定创新性,为我国高速铁路箱式路基结构优化研究提供了宝贵的技术经验。
In order to study the influence of box subgrade haunching on structural static characteristics of high-speed railway,a more reasonable box subgrade haunching method is found.In this paper,the box subgrade is divided into independent components,and the reinforcement mode of each independent component is calculated through static analysis.ABAQUS software is used for numerical simulation.In view of the stress concentration phenomenon at the connection node between the top plate and the vertical plate of the box subgrade structure,the influence of different haunching heights and angles of the triangular haunch on the stress concentration at the node is studied by using the control variable method,and the optimal haunching mode is proposed to optimize the static characteristics of the box subgrade structure.The analysis results show that when the fixed axillary height is 400 mm and the axillary angle is between 15°~60°,the stress mutation reduction ratio S_(r) value decreases with the increase of axillary angle;When the axillary angle is between 60°~75°,the S_(r) value increases with the increase of the axillary angle,and the optimal axillary angle is between 45°~60°.When the axillary angle is fixed at 60°,the S_(r) value decreases as the axillary length increases,and the optimal axillary length is between 300~400 mm.The determination of the reinforcement mode and the optimal haunching mode of the box type subgrade is innovative to a certain extent,and provides valuable technical experience for the research of structural optimization of box type Subgrade of high-speed railway in China.
作者
刘晶磊
刘佳凡
周玮浩
夏彬
张业荣
张伯扬
张文祥
LIU Jinglei;LIU Jiafan;ZHOU Weihao;XIA Bin;ZHANG Yerong;ZHANG Boyang;ZHANG Wenxiang(Hebei University of Architecture,Zhangjiakou 075000,China;Key Laboratory of Civil Engineering Diagnosis,Reconstruction and Disaster Resistance in Hebei Province,Zhangjiakou 075000,China;Hebei Cold Region Transportation Infrastructure Engineering Technology Innovation Center,Zhangjiakou 075000,China)
出处
《铁道标准设计》
北大核心
2024年第2期68-73,共6页
Railway Standard Design
基金
河北省高等学校科学研究重点项目(ZD2022017)
河北建筑工程学院研究生创新基金项目(XY202203)
青海省科技发展专项课题(2021QY-217)。
关键词
高速铁路
箱式路基
数值计算
结构形式
静力特性
high-speed railway
box subgrade
numerical calculation
structural style
static characteristics
